Added files for Prefix model

Changes to be committed:
	new file:   prefix/__init__.py
	new file:   prefix/admin.py
	new file:   prefix/apis.py
	new file:   prefix/apps.py
	new file:   prefix/migrations/__init__.py
	new file:   prefix/models.py
	new file:   prefix/selectors.py
	new file:   prefix/services.py
	new file:   prefix/urls.py

prefix/admin.py

@@ -0,0 +1,7 @@
+"""Prefix Admin Pannel
+"""
+
+from django.contrib import admin
+from prefix.models import Prefix
+
+admin.site.register(Prefix)

prefix/models.py

@@ -0,0 +1,18 @@
+from django.db import models
+from django.contrib.auth.models import Group, User
+from django.utils import timezone
+
+class Prefix(models.Model):
+    """
+    """
+
+    prefix = models.CharField(primary_key=True, max_length=5)
+    certifying_key = models.TextField(blank=True, null=True)
+    created = models.DateTimeField(default=timezone.now, blank=True, null=True)
+    description = models.TextField(blank=True, null=True)
+    owner = models.ForeignKey(User, on_delete=models.CASCADE, to_field="username")
+    authorized_groups = models.ManyToManyField(Group, blank=True, related_name='authorized_prefix')
+
+    def __str__(self):
+        """String for representing the BCO model (in Admin site etc.)."""
+        return f"{self.prefix}"

prefix/selectors.py

@@ -0,0 +1,7 @@
+
+
+def is_accessible_by(self, user):
+    """If no authorized_groups are specified, it's accessible by everyone"""
+    if self.authorized_users.exists():
+        return self.authorized_users.filter(id=user.id).exists()
+    return True

prefix/urls.py

@@ -0,0 +1,7 @@
+"""Prefix Admin Pannel
+"""
+
+from django.contrib import admin
+from prefix.models import Prefix
+
+admin.site.register(Prefix)